C#中combobox获datatable中的值

 //进行客户下拉列表的绑定

              DataTable dt=null;

              dt = _customerbll.selectName();

              // MessageBox.Show(dt.Rows[0]["customer_name"]+" "+dt.Rows[1]["customer_number"]);

               comboBox1.DataSource = dt;

               comboBox1.DisplayMember = "customer_name";

               comboBox1.ValueMember = "customer_name";

 获取备选中框中的值：